AO188/LGS status AO188 development group(Subaru Telescope, NAOJ) 2009.1.16 (JST)

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Presentation transcript:

AO188/LGS status AO188 development group(Subaru Telescope, NAOJ) (JST)

Outline  Current status  Risk shared open use  Commissioning schedule

Current stats on SR. 9.1 mag 15.7 mag 16.6 mag Aug 2008 Sep 2008 Oct 2008 Simulation  m Simulation  m Sky background Oct 2008

Current status  AO performance using natural guide stars (NGS)  Observed SR matched with simulation results at faint end.  Mismatch at bright end needs to be investigated.  Need more statistics at various seeing condition.  Detail analysis to compare the performance between simulation and observation is required.  Improvement on performance is planning.

Current status  Risk shared open use for AO188 with NGS  Imaging/Spectroscopy/Grism modes of IRCS are available.  AO acquisition time is about 10 to 15 minutes.  AO parameter tuning takes about 5 minutes.  9-points dithering  On slit dithering  Field rotation correction and PA selection by AO image rotator.

Current status  Engineering items.  Non sidereal object. (Jan 15, 16)  Field distortion. (Analysis is on going)  Laser projection. (Jan 15, 16)  F-conversion optics for IRCS. (on going)  Isoplanatic angle. (Analysis is going on)  Extended guide star performance. (on going)  And so on……

Upcoming work  Performance improvement.  Laser guide star (LGS) mode.  LGS upgrade at wavefront sensor.  Tip-tilt and focus guide star acquisition unit.  Tip-tilt and focus wavefront sensor.  Additional components.  ADC.  BS exchange system. (NGS mode LGS mode)

Schedule and milestone  Laser projection resumed on Jan 15.  9.5 engineering nights from Jan. to July.  S09A open use of NGS mode. (10 nights)  Some observing modes have a risk.  Fabrication, test and install for new components start around April, 2009.

Schedule and milestone  S09B open use of NGS mode.  Fully functional.  Engineering observation of LGS mode starts around autumn of  Risk shared open use of LGS mode from S10A.

Summary  Strehl Ratio at bright end is lower than that of simulation result.  Mostly operational in NGS mode.  Start testing on LGS mode this autumn.  Risk-shared open use of LGS mode will start from S10A.